General boosting question - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Pneub · 10-30-2013, 12:50 AM

I'm currently running the HKS Supercharger kit w/ new fuel pump, 700cc injectors, oil cooler, and I'm pushing about 8.5-9psi. The shop who has been doing most of my work says it is safe to push it to about 12psi on my stock internals. I believe they know their stuff but I wanted to hear what you guys might have to say about that. I'm not on here enough to browse all the threads of all the different setups people are pushing and how much boost they have going safely through their system. Any feedback is appreciated.

SmsAlSuwaidi · 10-30-2013, 12:52 AM

Quote:

Originally Posted by Pneub

I'm currently running the HKS Supercharger kit w/ new fuel pump, 700cc injectors, oil cooler, and I'm pushing about 8.5-9psi. The shop who has been doing most of my work says it is safe to push it to about 12psi on my stock internals. I believe they know their stuff but I wanted to hear what you guys might have to say about that. I'm not on here enough to browse all the threads of all the different setups people are pushing and how much boost they have going safely through their system. Any feedback is appreciated.

on e85 ? any day
on 91 ? hmmm

Pneub · 10-30-2013, 01:00 AM

Quote:

Originally Posted by SmsAlSuwaidi

on e85 ? any day
on 91 ? hmmm

This is on 91. Definitely have not converted to E85 yet and not really in the plans for awhile.

tech4pdx · 10-30-2013, 01:10 AM

Whoever is doing your tune (I HIGHLY recommend a local tuner) is who you should be talking to. Nobody on the internet is going to back you up if something goes wrong. With that said, I'm using 100% methanol injection on a 11.5-12 psi Innovate kit with 92 octane fuel and all has been well. This is a street car.

Pneub · 10-30-2013, 01:18 AM

I've talked to them and I have faith in them. It's Evasive Motorsports and their reputation is high and their work to date has been stellar. But I'm no more prepared to take their advice point blank than I am any one response on here. Regardless of the outcome if I blow my motor I'm responsible and not Evasive or anybody else. So the more input from the more knowledgeable people on here that I have the better I can make my choice to change the pulley or not.

SmsAlSuwaidi · 10-30-2013, 01:40 AM

Quote:

Originally Posted by Pneub

I've talked to them and I have faith in them. It's Evasive Motorsports and their reputation is high and their work to date has been stellar. But I'm no more prepared to take their advice point blank than I am any one response on here. Regardless of the outcome if I blow my motor I'm responsible and not Evasive or anybody else. So the more input from the more knowledgeable people on here that I have the better I can make my choice to change the pulley or not.

Psi isn't the only factor, timing and other crap plays a huge roll, but I'm sure ( mostly) it's going to knock on 91

tech4pdx · 10-30-2013, 01:40 AM

Fair enough. I agree that Evasive is legit. FWIW, I had similar concerns as you when I went from the 75mm to the 70mm Innovate pulley. My shop also expressed concern that the motor may be at higher risk. That's understandable, but I did it anyway and the results were surprisingly good. Boost preference on a supercharger is going to be different than on a turbo. The turbo guys almost always make more power on less boost. At the end of the day, it is going to be a choice based on risk assessment and aversion. Essentially we are all guinea pigs.

Cal3000 · 10-30-2013, 02:30 AM

Quote:

Originally Posted by Pneub

I've talked to them and I have faith in them. It's Evasive Motorsports and their reputation is high and their work to date has been stellar. But I'm no more prepared to take their advice point blank than I am any one response on here. Regardless of the outcome if I blow my motor I'm responsible and not Evasive or anybody else. So the more input from the more knowledgeable people on here that I have the better I can make my choice to change the pulley or not.

Wow. I got tuned by Evasive and they know their stuff. 12 psi? Have they done it on their car yet? They must be talking e85 for sure.

ft_sjo · 10-30-2013, 02:36 AM

Unless they have run 12 psi on your exact spec for extended periods then it's just nonsense. Boost pressure is not a generic mode of failure.

10-30-2013, 12:50 AM	#1
Pneub Senior Member Join Date: Apr 2013 Drives: Dark Grey BRZ Location: Huntington Beach Posts: 306 Thanks: 172 Thanked 143 Times in 77 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	General boosting question I'm currently running the HKS Supercharger kit w/ new fuel pump, 700cc injectors, oil cooler, and I'm pushing about 8.5-9psi. The shop who has been doing most of my work says it is safe to push it to about 12psi on my stock internals. I believe they know their stuff but I wanted to hear what you guys might have to say about that. I'm not on here enough to browse all the threads of all the different setups people are pushing and how much boost they have going safely through their system. Any feedback is appreciated. __________________ Completed build...for now

10-30-2013, 01:18 AM	#5
Pneub Senior Member Join Date: Apr 2013 Drives: Dark Grey BRZ Location: Huntington Beach Posts: 306 Thanks: 172 Thanked 143 Times in 77 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I've talked to them and I have faith in them. It's Evasive Motorsports and their reputation is high and their work to date has been stellar. But I'm no more prepared to take their advice point blank than I am any one response on here. Regardless of the outcome if I blow my motor I'm responsible and not Evasive or anybody else. So the more input from the more knowledgeable people on here that I have the better I can make my choice to change the pulley or not. __________________ Completed build...for now

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10-30-2013, 01:10 AM	#4
tech4pdx Make love Join Date: Nov 2012 Drives: H8R.. Not really Location: Edge of the Milky Way Posts: 780 Thanks: 524 Thanked 214 Times in 143 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Whoever is doing your tune (I HIGHLY recommend a local tuner) is who you should be talking to. Nobody on the internet is going to back you up if something goes wrong. With that said, I'm using 100% methanol injection on a 11.5-12 psi Innovate kit with 92 octane fuel and all has been well. This is a street car.

10-30-2013, 01:40 AM	#7
tech4pdx Make love Join Date: Nov 2012 Drives: H8R.. Not really Location: Edge of the Milky Way Posts: 780 Thanks: 524 Thanked 214 Times in 143 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Fair enough. I agree that Evasive is legit. FWIW, I had similar concerns as you when I went from the 75mm to the 70mm Innovate pulley. My shop also expressed concern that the motor may be at higher risk. That's understandable, but I did it anyway and the results were surprisingly good. Boost preference on a supercharger is going to be different than on a turbo. The turbo guys almost always make more power on less boost. At the end of the day, it is going to be a choice based on risk assessment and aversion. Essentially we are all guinea pigs.

10-30-2013, 02:36 AM	#9
ft_sjo Banned Join Date: Oct 2012 Drives: GT86 Location: The Motherland Posts: 1,398 Thanks: 140 Thanked 473 Times in 271 Posts Mentioned: 22 Post(s) Tagged: 0 Thread(s)	Unless they have run 12 psi on your exact spec for extended periods then it's just nonsense. Boost pressure is not a generic mode of failure.

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